'use client';

import { Suspense, useEffect, useState } from 'react';
import { useSearchParams, useRouter } from 'next/navigation';
import Link from 'next/link';

function SuccessContent() {
  const params = useSearchParams();
  const router = useRouter();
  const [status, setStatus] = useState<'loading' | 'success' | 'error'>('loading');
  const [errorMsg, setErrorMsg] = useState('');
  const [productName, setProductName] = useState('');

  useEffect(() => {
    const paymentKey = params.get('paymentKey');
    const orderId = params.get('orderId');
    const amount = Number(params.get('amount'));
    const returnUrl = params.get('returnUrl');

    if (!paymentKey || !orderId || !amount) {
      setStatus('error');
      setErrorMsg('잘못된 접근입니다.');
      return;
    }

    fetch('/api/payment/confirm', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ paymentKey, orderId, amount }),
    })
      .then((res) => res.json())
      .then((data) => {
        if (data.success) {
          setProductName(data.data?.orderName ?? '');
          setStatus('success');
          if (returnUrl) {
            router.replace(returnUrl);
          }
        } else {
          setStatus('error');
          setErrorMsg(data.error || '결제 승인에 실패했습니다.');
        }
      })
      .catch(() => {
        setStatus('error');
        setErrorMsg('서버 오류가 발생했습니다. 결제 내역을 확인해주세요.');
      });
  }, []);

  if (status === 'loading') {
    return (
      <div className="text-center py-20 px-6">
        <div className="w-12 h-12 border-2 border-blue-600 border-t-transparent rounded-full animate-spin mx-auto mb-4" />
        <p className="text-slate-500 text-sm">결제를 확인하는 중...</p>
      </div>
    );
  }

  if (status === 'error') {
    return (
      <div className="text-center py-20 px-6">
        <div className="w-16 h-16 rounded-full bg-red-50 border-2 border-red-200 flex items-center justify-center mx-auto mb-5">
          <svg className="w-8 h-8 text-red-400" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
          </svg>
        </div>
        <h2 className="text-xl font-bold text-[#04102b] mb-2">결제 처리 실패</h2>
        <p className="text-slate-500 text-sm mb-8">{errorMsg}</p>
        <div className="flex justify-center gap-3">
          <Link href="/mypage" className="inline-flex items-center gap-2 bg-white border border-[#dbe8ff] text-slate-600 px-5 py-2.5 rounded-xl font-semibold text-sm hover:bg-slate-50 transition">
            결제 내역 확인
          </Link>
          <Link href="/" className="inline-flex items-center gap-2 bg-[#1a56db] hover:bg-[#1e4fc2] text-white px-5 py-2.5 rounded-xl font-semibold text-sm transition">
            홈으로 →
          </Link>
        </div>
      </div>
    );
  }

  return (
    <div className="text-center py-20 px-6">
      <div className="w-16 h-16 rounded-full bg-emerald-50 border-2 border-emerald-400 flex items-center justify-center mx-auto mb-5">
        <svg className="w-8 h-8 text-emerald-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2.5} d="M5 13l4 4L19 7" />
        </svg>
      </div>
      <div className="inline-block bg-emerald-50 border border-emerald-200 text-emerald-700 text-xs font-bold px-3 py-1 rounded-full mb-4">
        결제 완료
      </div>
      <h2 className="text-2xl font-extrabold text-[#04102b] mb-2">결제가 완료되었습니다!</h2>
      {productName && (
        <p className="text-slate-500 text-sm mb-1">{productName}</p>
      )}
      <p className="text-slate-400 text-sm mb-8">
        마이페이지에서 결제 내역과 서비스 이용 현황을 확인하세요.
      </p>
      <div className="flex justify-center gap-3 flex-wrap">
        <Link
          href="/mypage?tab=payments"
          className="inline-flex items-center gap-2 bg-[#1a56db] hover:bg-[#1e4fc2] text-white px-6 py-3 rounded-xl font-semibold text-sm shadow-lg shadow-blue-600/20 transition"
        >
          결제 내역 확인 →
        </Link>
        <Link
          href="/"
          className="inline-flex items-center gap-2 bg-white border border-[#dbe8ff] text-slate-600 px-6 py-3 rounded-xl font-semibold text-sm hover:bg-slate-50 transition"
        >
          홈으로
        </Link>
      </div>
    </div>
  );
}

export default function PaymentSuccessPage() {
  return (
    <div className="min-h-full bg-[#f0f5ff] flex items-center justify-center px-6 py-16">
      <div className="w-full max-w-md bg-white rounded-2xl border border-[#dbe8ff] shadow-lg overflow-hidden">
        <div className="bg-[#04102b] px-6 py-4" style={{ backgroundImage: 'repeating-linear-gradient(135deg, rgba(255,255,255,0.012) 0px, rgba(255,255,255,0.012) 1px, transparent 1px, transparent 40px)' }}>
          <div className="flex items-center gap-2">
            <div className="w-7 h-7 rounded-lg bg-[#1a56db] flex items-center justify-center text-white font-bold text-xs">
              쟁
            </div>
            <span className="text-white font-bold text-sm">쟁승메이드 결제</span>
          </div>
        </div>
        <Suspense fallback={
          <div className="py-20 text-center">
            <div className="w-8 h-8 border-2 border-blue-600 border-t-transparent rounded-full animate-spin mx-auto" />
          </div>
        }>
          <SuccessContent />
        </Suspense>
      </div>
    </div>
  );
}